Also from the same website as my previous post, written by Maestro David L. Jones. http://www.voiceteacher.com/children_article/children.html
Some excerpted information from this article:
Abusive Practices in the Child’s Voice:
1. Heavy belting: taking chest voice higher than is healthy.
2. High larynx singing, keeping a child-like sound when the voice should be allowed to drop and fill out in tone. This often happens between 13 and 15 for young girls, usually later for boys.
3. Forward thrusting jaw to ‘belt it out’.
4. Singing too loudly, singing with too much breath pressure in tonal production, only learning loud pushed singing.
5. Imitating pop or rock singers that are adults.
6. Forcing an adult sound using the depression of the larynx with the tongue-root and/or hyperextension of the laryngeal muscles.
7. General singing with mouth vowels without enough open pharyngeal space, which protects the vocal folds.